Turntable support



Nov,y 11, 1930. H. H. TALBOYS 1,781,348

TURNTABLE SUPPORT Filed March 31, 1928 2 Sheets-Sheet l NOV. 11, 1930. H, H, TALBOYS 1,781,348

TURNTABLE SUPPORT Filed March 3l, 1928 2 Sheets-Sheet 2 UIOI il/717 n Patented Nov. 11, 1930 ,UNITED4 STATES HENRY H. TALBoYs,` E MILWAUKEE, wisCoNsIN, AssIGNoR To NORDBERG MANUFAC- TURING COMPANY, 0E MILWAUKEE, WISCONSIN, A CoRPoRATToN CE WISCONSIN PATENT OFFICE TURNTABLE SUPPORT Application ined March 31, 192s. serial No. 266,323.

Thisinvention pertains to turntable supports designed more particularly for use in conjunction with portable mechanical shovels, cranes and like instrumentalities.

Mechanical shovels and cranes when operating underrload necessarily place `severe strains upon their turntable supports and the main object of the present invention is to provide a structure which, while standing up under the work, is at the same time such as to insure ease of manipulation with conse uent speed in handling. *or the purpose of description the turn- .table is shown and described herein in con* junction with a mechanical shovel 2 but it is to be understood that'the invention is not limited to such and the description of the shovel is to be taken as the equivalent of other mechanisms. i i

The invention is illustrated in the annexed drawings, wherein:

v Figure 1 is a vertical longitudinal sectional view with the operating parts of the shovel proper shown in outline,

Figure 2 a top plan view partly broken away and partly in section of the shovel frame support and the truck upon which the same is mounted, and Figure 3 an enlarged detail sectional view illustrative of the means employed for introducing the balls into the raceway between the supporting frame and the truck frame and maintaining them in place.

The shovel mechanism, as such, may be of any approved form, but preferably of that type wherein compressed air is employed as the power medium.

Suchmechanism is denoted by 1 and is mounted upon and secured to a turn-table or frame 2, which in the form shown is provided with a centrally disposed opening and ,at its periphery withan overhanging flange 3. It is also provided adjacent its periphery with an enlargement 4; in which is formed one-half of a raceway for a series of supporting balls, the latter being designated by 5 The truck frame is denoted by 6 and has y mounted in each end thereof axles 7 carrying flanged wheels 8 adapted to run upon a track as 9, Figure l. The axles are tied to each other by longitudinal side frames or bars 10, which in turn form the support for transverse bars or rods 11 and l2, which form the support for the rail clamps 13 of any approved type. ,i i

Aipair of stabilizing bars 14 and 15 ex-` tend transversely of the truck frame Ll, said rods extending through the side bars 10 and being susceptible of manual longitudinal adjustment so that they may be projected to opposite sides of the truck. These bars will, in operation of the structure and the posi tioning of the car upon the track,V take against suitable supports at their outer ends, as for instance ties or the lilre placed thereunder, in order that the shovel as a whole may be kept from rocking and the rail clamps caused to maintain their proper position.

The truck frame 6, orimore specifically the central casting or element thereof, is provided with a central opening into which the turntable or rotatable member extends. The truck frame is provided in its inner vertical face with a semicircular raceway complemen-` tal Ato the raceway formed in the turntable for the reception of the balls 5.

As will be best seen upon reference to Figure 3, the adjacent vertical faces of the members t and 6 are cut away yas at 16 and 17 to provide a passageextending from the upper faces of said members for the introduction of the balls 5 into the raceway.

After the raceway has been filled a cover plate 18 is securedto the member 2 by tap screws 19,` said plate being provided with a downwardly extending plug or projection 2() adapted to fill theupper portion of the groove or cut away part 17. It is to be noted that the plug is not wide enough, however, to extend across into the opening 16 so that there is no interference between the parts when the turn-table 21is rotated with reference to the truck frame. j y A screw plug 21 is mounted in the cap piece 18 and affords a ready means through which lubricant may be introduced to the balls within the race.

Securedupon the outer face of the body the direct control or member 6 is a circular rack 22 and a pinion 23, Figure l, meshes therewith. Said pinion is formed upon the lower end of a rotatable shaft to which motion is imparted through a motor 24, the operation of which is under of the operator through means not shown.

In operationy of the device, where the shovelv (not shown), which is carried at the outer ends or"" the thrust Vbeams Vor arms '25 (one only-of-which isshown) is forced into the' material to be removed, or wheretheshovell is raised and extended over a' car withv a view of unloading the shovelythe tendency of the load is to tilt the turn-table and to place a downward thrust upon the balls adj aceiit one side of the table and an upward thrust at the opposite side, this thrust changing continually depending upon what operationsare being performedr bythe shovel.

ln practice the b lls arequite large,those of one and one-quarter inch diameter having been employed.

'It has been found that under the severest Vvservice conditionsthebearing holds up and inasmuch as 1t is ahousedzone'littleor nov ditculty inheresfrom thepresence of eX- traneous or foreign matter. .lfuiitliermorea the overhanging member 8 likewise `houses the raclf` and the' pinion is also vsubstantially housed by :giving the outer portion ofthe casting ror turn-table2 the'contoiir shownin Figure l, where, as. will be seen,` it is provided with an .opening forthe lower Vportion )of the i motor mounting with an incurved portion'QG which surroundsthefpinion in; spaced rela- `1. `lneombination a truck framefhaving a tion thereto.

in the raceway, said raceway having an opening extending upwardly therefrom throughY which the balls may be introduced; and a rei movable closure for said opening. 1

3. In combination a truck :traine having a circular opening formed therein; a supporting element for a shovel orV similar instrumentality,.said element having a depending p0r- Ltion extendinginto thetruck vframe opening the opposing races of said circular opening and said element being contoured tor-forma Yball raceway therebetween, said supporting element likewise having a depending flange extending around the saine; a series of balls Y located inthe raceway and locking the parts against relative tipping movement; a circular rack carried by the truck frame; a pinion meshing therewith; and means mounted upon the supporting elementfor driving the lDinion. Y

4c. In combination a truckfframe having a vertically disposedinternal face; a supportingelement for a sliovelror similar instrumentality; :and a ball bearing interposed between the peiiiphefralverticallydisposed face Vof the supporting element andthe adjacent f 'As above noted:thez'tableV construction Vis eiiettive where theV mechanism carried thereby is subjected to loadoutward of the table thereby placing artorsional strain upon .the table bearing.'r Inasmuch asl .there is 'rioking pin employedthere is noV chance for inisalignmentaorfcramping which commonly obtains 1' when the king pin-becomesV worn.

" What isfclaimed is.: I

,circular opening formed. therein; va supporting elementV fora shovel or similar instrumentality, said support having- V adepending portion extending intojthe frame opening, the opposingvertically disposedafaces ofsaid soY frame and elementfbeing contoured to form l ball raceway and a series of balls mounted' in said raceway, said yballsforming the sole support for thesupportingelement and lock-` ingthe same to thetruck.

f2. VInV vcombinationa truck frame havingia circular opening formedtherein; a support.-

" ing element having a dependingportion eX-i tending into the truck frame opening, the op-Y posingvertically disposed yfaces of said opening-and the adjacentfface v'of-L the suppoirting` y element being contoured to form ab'allv racewaytherebetweenaaseries @Malls-mounted f A 

